file Akabak for beginers

8 years 9 months ago #10279 by bee
Replied by bee on topic Akabak for beginers
ok im getting there with this new cab but...........

how do i sim multiple cabs........ the plot ive got looks good for 1 cab. but i would like to say look at a plot of 4 cabs.........

this is the plot so far....



and the script is.........

|=========================================================================================

|Network node numbers for this 6th order bandpass speaker used b&C 18nw100

|Radiator(1)-3-Port-4-Chamber-5-Driver-6-Chamber-8-Segment-9-Radiator(2)

|=========================================================================================

Def_Driver 'Driver'

FS=31Hz
Re=5.1ohm
Qes=0.27
Qms=4.2
Vas=252dm3
Sd=1210cm2
Mms=211g
Bl=28.00Tm
Le=1.70mH

Cms=8.96E-05m/N
Rms=9.91Ns/m
ExpoLe=1

System 'System'

Driver Def='Driver''Driver'
Node=1=0=5=6

Def_Reflector
Wall=100cm HAngle=0 VAngle=-90°

Radiator 'Port outlet'
Node=3
SD=584.00cm2
Label=1

Duct 'Port'
Node=3=4
SD=584.00cm2
Len=35.00cm
Visc=0

Duct 'Rear chamber'
Node=4=5
SD=1030.00cm2
Len=50.40cm
Visc=0

Duct 'Throat chamber'
Node=6=8
SD=2120.00cm2
Len=75.0cm
Visc=0

Duct 'Horn segment 1'
Node=8=9
SD=484.00cm2
Len=58.50cm
Visc=0

Radiator 'Horn mouth'
Node=9
SD=484.00cm2
Label=2

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8 years 9 months ago #10373 by bee

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8 years 9 months ago #10376 by bitzo
Replied by bitzo on topic Akabak for beginers
put n parameter on the declarative part...this is the number of bins...
then multipli the s value in each horn section by n, the same for duct surface, compression chamber and rear chamber.
should be nice to use the rectangular form defining hth wth hmo wmo, so you can choice how do you stack the bins...vertical multiply h by n horizontal, w by n.

after that....add
Driver Def='Driver''Driver1'
Node=1=0=5=6

opinion?

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8 years 3 months ago #13152 by Reverb
Replied by Reverb on topic Akabak for beginers
Bee

Quote from original post: “Akabak for Beginers” Posted: 27 Oct 2009 00:09

>>>Hope you are keeping up........

All nodes in a script link together for example, you would define a driver nodes 0 and 1, the rear chamber node 2, and then a series of waveguides, or acoustic horns nodes 3 and 4. The difference between a waveguide and a horn is that a horn is an output of sound, and a waveguide will be connected to another acoustic element in your design.

node 0 = negative
node 1 = positive
node 2 = rear chamber
node 3 = Wave guide
node 4 = horn mouth

Hope you get the idea. By using the node method you have an unlimited amout of modeling can be done covering all acoustic systems.


Bee, I believe I can jump start my learning curve on Akabak by nailing down some of the lingo first. I’m currently reading three speaker books and loads of info on the net that I have located over the past couple of days to speed up the learning curve as well.

My first question in regards to Akabak is…. What is a waveguide?

Found this after searching in Google but still not quite grasping what a waveguide is and how we use waveguides in Akabak..

A waveguide is a structure which guides waves, such as electromagnetic waves or sound waves.

Source: http://en.wikipedia.org/wiki/Waveguide

Also found this but too advanced in their explanation….
http://en.wikipedia.org/wiki/Waveguide_ ... gnetism%29

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8 years 3 months ago #13156 by Reverb
Replied by Reverb on topic Akabak for beginers
Members,

I just realized that my Akabak newbie question in the previous post appears on this "Advanced Discussion" Forum. Please let me know if this level of questioning is acceptable on this thread or if I should start a new thread in regards to "Akabak Newbie" on the "General Forum".

I just wanted to keep things together as my questions relate to what Bee wrote in this very helpful "Akabak for Beginners" tutorial thread. Thank you.

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8 years 3 months ago #13167 by bee
Replied by bee on topic Akabak for beginers
no its cool to post this question hear,after all if you asked the question im sure others allso may want to know.....

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8 years 3 months ago #13170 by bee
Replied by bee on topic Akabak for beginers
wave guide is a part of the horn, lets say your horn has 3 sections each section is a differant size to the last, each wave guide makes up the overall horn.

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8 years 3 months ago #13186 by Reverb
Replied by Reverb on topic Akabak for beginers
Thanks Bee,

>>>wave guide is a part of the horn, lets say your horn has 3 sections each section is a differant size to the last, each wave guide makes up the overall horn.

Is the term "waveguide" associated with Akabak only? or is it an industry term in regards to speaker/enclosure design?

Also, when you say, "lets say your horn has 3 sections each section is a differant size to the last, each wave guide makes up the overall horn". Do you define waveguides as in my drawing below? My drawing is only 2 dimensional. Is 3 dimensional required? Thank you.

File Attachment:

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8 years 3 months ago #13188 by bee
Replied by bee on topic Akabak for beginers
Part one on your horn would be the throat, the second part would be the wave guide the final part would be the horn...

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8 years 3 months ago #13193 by bitzo
Replied by bitzo on topic Akabak for beginers
wally, depends how do you model the horn. You can mantain the height equal for all the elements like like in jbl2397 horn, or you can gradually enlarge it. If the width x height is the same for both options the spl shoud be the same (without floor) but the dispersion should be different.
However if you get the basic from the bee's how to, manual and help are pretty clear.

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